# Returns a map that loosely represents the object `self`.
	#
	# Warning: by default the method returns an empty Map.
	# It is done this way so that subclasses can just call `super` and add their own attributes.
	#
	# Forgetting to redefine `derive_to_map` will broke the expectation of the user of the class
	# Since an empty map is not POLA.
	#
	# Note that the semantic of keys and values is let unspecified.
	# Moreover, there is no specification nor mechanism to avoid key collision.
	fun derive_to_map: Map[String, nullable Object]
	do
		return new HashMap[String, nullable Object]
	end